TR1CHOCEPHALUS. 



[ 651 ] 



TRICHODESMIUM. 



TRICHOCEPHALUS, Goeze A genus 

 of Entozoa, of the order Ccelelmintha, and 

 family Nematoidea. 



Char. Body elongate, composed of two 

 parts, the anterior longer and capillary ; the 

 posterior becoming suddenly broader; spi- 

 culum of male simple, long, and surrounded 

 by a sheath. 



The (ten) species occur in the large intes- 

 tine, principally the ca3cum of man and the 

 mammalia. 



T. dispar (PI. 16. fig. 19, the male; fig. 

 21, the female, in which the narrowed por- 

 tion is too short). 



Anterior portion of the body spiral in the 

 male, containing the oesophagus only, or the 

 first moniliform portion of the intestine; 

 posterior portion containing the rest of the 

 intestine and the reproductive organs. Anus 

 situated at the posterior obtuse end of the 

 body. Integument transversely striated, 

 and with a longitudinal band studded with 

 papillae (PL 16. fig. 20). Oviduct termi- 

 nating at the point of junction of the two 

 portions of the body ; ova (fig. 21 a) oblong, 

 covered by a resistent shell, with a short 

 neck at each end. 



BIBL. Dujardin, Helminthes, 30 ; Owen, 

 Todd's Cycl. Anat. fy Phys., art. Entozoa ; 

 Wedl, Pathol. Histolog. 787. 



TRICHOCOLEA, Nees. A genus of 

 Jungermannise(Hepaticace8e),containingone 

 British species, T. (Jung.} tomentella, grow- 

 ing in moist places in the west and north of 

 England, Scotland, and Ireland. It is re- 

 markable for the character of the leaves, 

 which are cut up into compound capillary 

 segments, giving the plant a spongy texture. 

 Colour pale. 



BIBL. Hook. Brit. Flor. ii. pt. 1. p. 127, 

 Brit. Jung. pi. 36 ; Eckart, Synops. Jung. 

 pi. 6. fig. 49 ; Endlicher, Gen. Plant. Supp. 

 1. No. 472, 15. 



TRICHODA, Miill., Ehr. A genus of 

 Infusoria, of the family Enchelia. 



Char. Body free from hairs or cilia; teeth 

 absent ; mouth obliquely truncated, ciliated, 

 with a lip, but neck absent. 



The six species are colourless. 



T. pura. Body oblong, clavate, attenuate 

 in front. Aquatic; length 1 -720''. A spe- 

 cies of Dujardin' s genus Acomia. 



The other species have been very imper- 

 fectly examined and illustrated. 



Dujardin's genus, which is placed in the 

 family Trichodina, D., differs entirely from 

 that of Ehrenberg. The characters are : 

 Body ovoid-oblong or pyriform, slightly 



flexible in front, with a row of cilia directed 

 backwards, and appearing to indicate the 

 presence of a mouth. 



T. angulata (PI. 25. fig. 7). Body oblong, 

 obliquely and irregularly folded or angular, 

 frequently with one or more superficial va- 

 cuoles. Aquatic; length 1-900". 



T. pyrum, D. = Leucophrys carnium, E. 



BIBL. Ehrenberg, Infus. 306 ; Dujardin, 

 In/us. 395. 



TRICHODACTYLUS,Dufour. A genus 

 of Arachnida, of the order Acarina, and fa- 

 mily Acarea. 



Char. Rostrum short, with minute setae ; 

 fourth pair of legs shorter than the rest, 

 without claws, and terminated by a very 

 long seta. 



T. osmicB. Glabrous, with two marginal 

 setae on each side ; pale red ; legs and pos- 

 terior part of the body darker. Length 

 1-50". P 



Found upon the thorax of an Osmia (a 

 kind of mason-bee). 



BIBL. Dufour, Ann. des Sc.nat. 2 ser. xi. 

 276; Gervais, Walckenaer'sApteres, iii.266. 



TRICHODECTES, Nitzsch. A genus of 

 Anoplurous Insects, of the family Philopte- 

 ridae. 



Char. Antennas filiform, three-jointed; 

 maxillary palpi none or inconspicuous ; 

 mandibles two-toothed ; tarsi with one claw. 



Ten species, parasitic upon quadrupeds, 

 viz. the dog, cat, fox, weasel and stoat, ox, 

 horse, sheep, the red and the fallow deer. 



T. latus (PL 28. fig. 6). Abdomen pale 

 fulvous; head and thorax ferruginous yel- 

 low ; head subquadrate, with two black spots 

 in front, and a black lateral band on each 

 side ; abdomen oval. 



Common upon dogs, especially puppies. 



BIBL. Denny, Anoplur. Monograph. 186. 



TRICHODERMA, Pers. A genus of 

 Fungi placed by Fries among the Onygenei 

 (Ascomycetes), but apparently of doubtful 

 place. The plants are characterized by a 

 roundish peridium composed of interwoven, 

 ramified septate filaments, evanescent at the 

 summit ; the spores minute, heaped together, 

 at first conglobated. T. viride, growing on 

 fallen trees, has a white villous peridium, 

 and dusky green globose spores. The peri- 

 dia appear as scattered spots 1-20 to 1-8" or 

 more in diameter. 



BIBL. Berk. Brit. Flor. ii. pt. 2. p. 323; 

 Greville, Sc. Crypt. Fl. pi. 271; Fries, Summa 

 Veg. p. 417. 



TRICHODESMIUM, Ehrenb. A genus 

 of microscopic Algae, apparently belonging 



